/*-
 * ============LICENSE_START=======================================================
 * SDC
 * ================================================================================
 * Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ============LICENSE_END=========================================================
 */
package org.openecomp.sdc.tosca.csar;

import static org.openecomp.core.validation.errors.ErrorMessagesFormatBuilder.getErrorWithParameters;
import static org.openecomp.sdc.tosca.csar.ManifestTokenType.ATTRIBUTE_VALUE_SEPARATOR;
import static org.openecomp.sdc.tosca.csar.ToscaMetaEntryVersion261.ENTRY_DEFINITIONS;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import org.apache.commons.io.IOUtils;
import org.openecomp.sdc.common.errors.Messages;
import org.openecomp.sdc.datatypes.error.ErrorLevel;
import org.openecomp.sdc.datatypes.error.ErrorMessage;

public class OnboardingToscaMetadata implements ToscaMetadata {

    private Map<String, String> metaEntries;
    private List<ErrorMessage> errors;

    private OnboardingToscaMetadata() {
        metaEntries = new HashMap<>();
        errors = new ArrayList<>();
    }

    /**
     * Method parses input stream of meta file, only block_0 is parsed, the rest of metadata ignored
     *
     * @param st meta file input stream
     * @return OnboardingToscaMetadata instance
     * @throws IOException
     */
    public static ToscaMetadata parseToscaMetadataFile(InputStream st) throws IOException {
        if (st == null) {
            throw new IOException(Messages.METADATA_PARSER_INTERNAL.getErrorMessage());
        }
        OnboardingToscaMetadata meta = new OnboardingToscaMetadata();
        List<String> metadataLines = IOUtils.readLines(st, "utf-8");
        for (String line : metadataLines) {
            line = line.trim();
            if (line.isEmpty()) {
                return meta;
            }
            String[] entry = line.split(ATTRIBUTE_VALUE_SEPARATOR.getToken());
            //No empty keys allowed, no empty values allowed
            if (entry.length < 2 || entry[0].isEmpty()) {
                meta.errors.add(
                    new ErrorMessage(ErrorLevel.ERROR, getErrorWithParameters(Messages.METADATA_INVALID_ENTRY_DEFINITIONS.getErrorMessage(), line)));
                //want to get all error lines in meta file block_0, no breaking loop
            } else {
                meta.metaEntries.put(entry[0].trim(), entry[1].trim());
            }
        }
        if (!meta.metaEntries.containsKey(ENTRY_DEFINITIONS.getName())) {
            meta.errors.add(new ErrorMessage(ErrorLevel.ERROR, getErrorWithParameters(Messages.METADATA_NO_ENTRY_DEFINITIONS.getErrorMessage())));
        }
        return meta;
    }

    @Override
    public boolean isValid() {
        return errors.isEmpty();
    }

    @Override
    public List<ErrorMessage> getErrors() {
        return ImmutableList.copyOf(errors);
    }

    @Override
    public Map<String, String> getMetaEntries() {
        if (!isValid()) {
            return Collections.emptyMap();
        }
        return ImmutableMap.copyOf(metaEntries);
    }

    @Override
    public boolean hasEntry(final String entry) {
        return metaEntries.containsKey(entry);
    }

    @Override
    public Optional<String> getEntry(final ToscaMetaEntry entry) {
        return Optional.ofNullable(metaEntries.get(entry.getName()));
    }
}
